A mobile multi-parameter adjustable bridge tuned mass damper

Abstract

The application discloses a mobile multi-parameter adjustable bridge tuned mass damper and belongs to the technical field of bridge vibration reduction. The damper base is provided with a guide wheel below, a mass unit limiting mechanism and a spring unit above, a mass unit above the spring unit, a top steel plate above the mass unit limiting mechanism, and an adjustable damping unit connected with the mass unit. The damper base is provided with the above-mentioned mobile multi-parameter adjustable bridge tuned mass damper. The mass unit, the adjustable damping unit and the spring unit can flexibly adjust the mass, damping and stiffness parameters of the damper, thereby realizing the suppression of harmful vibrations in different frequency bands. Meanwhile, due to the mobile characteristics, the damper can be distributed in different spaces as needed. The damper can be removed and reused at any time when not in use, thereby reducing the maintenance cost of the bridge.

Description

Technical Field

[0001] This invention relates to the field of bridge vibration reduction technology, and in particular to a mobile, multi-parameter adjustable bridge tuned mass damper. Background Technology

[0002] In bridge engineering, wind-induced vibration is a common problem affecting bridge structural safety and driving comfort. Tuned mass dampers can effectively suppress such harmful vibrations. A tuned mass damper typically consists of a mass element, a damping element, and a spring element. By setting reasonable stiffness parameters, its natural frequency is matched with a certain modal frequency of the bridge structure, thus achieving resonance; the damping element dissipates vibration energy, achieving vibration reduction.

[0003] However, tuned mass dampers typically have a narrow control bandwidth, and their optimal control performance depends on the mass, stiffness, and damping parameters that are precisely matched to the target mode. When bridges experience multi-mode vibrations, they are insufficient to meet the requirements, necessitating the deployment of multiple sets of damper units with different parameters, leading to increased cost and maintenance complexity. Wind fields are random, and vortex-induced vibrations only occur within specific wind speed ranges; under other conditions, the dampers are ineffective, yet they add extra dead load mass, reducing structural safety redundancy.

[0004] Therefore, there is an urgent need for a bridge tuned mass damper that is easy to move and has adjustable parameters. Summary of the Invention

[0005] The purpose of this invention is to provide a mobile, multi-parameter adjustable bridge tuned mass damper. Through a mass unit, an adjustable damping unit, and a spring unit, the damper's mass, damping, and stiffness parameters can be flexibly adjusted to suppress harmful vibrations in different frequency bands. Furthermore, due to its portability, it can be spatially distributed in various ways, and can be removed and reused when not in use, reducing the daily burden on bridges, improving the utilization rate of the damper, and lowering bridge maintenance costs.

[0006] To achieve the above objectives, the present invention provides a mobile, multi-parameter adjustable bridge tuned mass damper, comprising a damper chassis, a guide wheel disposed below the damper chassis, a mass unit limiting mechanism and a spring unit disposed above the damper chassis, a mass unit disposed above the spring unit, a gas-liquid separator plate disposed within the mass unit, the gas-liquid separator plate dividing the mass unit into an air chamber and a counterweight liquid chamber, the spring unit comprising a compression spring and a threaded support steel column, a support steel arm disposed on the threaded support steel column, the support steel arm being connected to a friction-type buckle, the friction-type buckle being connected to the compression spring, a top steel plate disposed above the mass unit limiting mechanism, an adjustable damping unit connected to the mass unit, and the other end of the adjustable damping unit being connected to the damper chassis.

[0007] Preferably, damper fixing feet and negative pressure suction cups are provided below the four corners of the damper chassis.

[0008] Preferably, a hydraulic mechanism is provided on the damper chassis, and the hydraulic mechanism is connected to the damper fixing feet.

[0009] Preferably, the negative pressure suction cup is provided with a negative pressure generating mechanism.

[0010] Preferably, the air chamber is located above the gas-liquid separator, and the counterweight liquid chamber is located below the gas-liquid separator.

[0011] Preferably, a sealing ring is provided between the gas-liquid separator and the inner wall of the mass unit.

[0012] Preferably, the mass unit is equipped with a gas valve and a counterweight liquid valve, the gas valve being connected to the air chamber and the counterweight liquid valve being connected to the counterweight liquid chamber.

[0013] Preferably, the mass unit limiting mechanism is located at the four corners of the damper chassis, and the four corners of the mass unit are fitted with the mass unit limiting mechanism.

[0014] Preferably, the spring unit includes a plurality of compression springs arranged in an array, the upper end of the compression springs is connected to a top support steel plate, the top support steel plate is connected to the mass unit, the threaded support steel column is located at the center of the compression springs, the lower end of the threaded support steel column is connected to a bottom support steel plate, and the bottom support steel plate is connected to the damper chassis.

[0015] Preferably, screw-in nuts are provided on the threaded support steel columns at both ends of the support steel arm, each support steel arm is connected to a plurality of friction-type buckles, and the top support steel plate is connected to the compression spring through spring fixing buckles.

[0016] Therefore, the present invention employs a mobile, multi-parameter adjustable bridge tuned mass damper, which, through a mass unit, an adjustable damping unit, and a spring unit, allows for flexible adjustment of the damper's mass, damping, and stiffness parameters, thereby suppressing harmful vibrations in different frequency bands. Furthermore, due to its portability, it can be spatially distributed in various ways, and can be removed and reused when not in use, reducing the daily burden on the bridge, improving the damper's utilization rate, and lowering the bridge's maintenance costs.

[0017] The technical solution of the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. Attached Figure Description

[0018] Figure 1This is a schematic diagram of an embodiment of a mobile, multi-parameter adjustable bridge tuned mass damper according to the present invention. Figure 2 This is a schematic diagram of the mass unit structure of an embodiment of a mobile, multi-parameter adjustable bridge tuned mass damper according to the present invention. Figure 3 This is a schematic diagram of the spring unit structure of an embodiment of a movable, multi-parameter adjustable bridge tuned mass damper according to the present invention.

[0019] Figure Labels 1. Top steel plate; 2. Mass unit limit mechanism; 3. Mass unit; 4. Adjustable damping unit; 5. Gas valve; 6. Counterweight liquid valve; 7. Spring unit; 8. Damper chassis; 9. Damper fixing support; 10. Negative pressure suction cup; 11. Guide wheel; 12. Sealing ring; 13. Gas-liquid separator plate; 14. Top support steel plate; 15. Compression spring; 16. Support steel arm; 17. Threaded support steel column; 18. Spring fixing buckle; 19. Screw-in nut; 20. Friction type buckle; 21. Bottom support steel plate; 22. Hydraulic mechanism; 23. Air chamber; 24. Counterweight liquid chamber. Detailed Implementation

[0020] The technical solution of the present invention will be further described below with reference to the accompanying drawings and embodiments.

[0021] Unless otherwise defined, the technical or scientific terms used in this invention shall have the ordinary meaning understood by one of ordinary skill in the art to which this invention pertains. The terms "first," "second," and similar terms used in this invention do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Terms such as "comprising" or "including" mean that the element or object preceding the word encompasses the elements or objects listed following the word and their equivalents, without excluding other elements or objects. Terms such as "connected" or "linked" are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. Terms such as "upper," "lower," "left," and "right" are used only to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0022] Example 1 This invention provides a mobile, multi-parameter adjustable bridge tuned mass damper, such as... Figure 1 As shown, the damper includes a damper chassis 8, and guide wheels 11 are provided below the damper chassis 8. The guide wheels 11 are located at the four corners below the damper chassis 8. The guide wheels 11 make it easy to move the tuned mass damper, allowing the tuned mass damper to move easily on the bridge deck and be deployed in different locations.

[0023] The damper chassis 8 has damper mounting feet 9 and negative pressure suction cups 10 located below its four corners. A hydraulic mechanism 22 is mounted on the damper chassis 8, connected to the damper mounting feet 9. The hydraulic mechanism 22 controls the height of the damper mounting feet. When the tuned mass damper needs to be moved, the hydraulic mechanism 22 drives the damper mounting feet upwards, allowing the guide wheel 11 to touch the ground for easy movement. When the tuned mass damper needs to be fixed in place, the hydraulic mechanism 22 drives the damper mounting feet downwards, lifting the tuned mass damper and suspending the guide wheel for easy fixation.

[0024] The negative pressure suction cup 10 is used to further fix the tuned mass damper. A negative pressure generating mechanism is installed inside the negative pressure suction cup 10. The negative pressure generating mechanism can generate negative pressure at the negative pressure suction cup 10. During operation, the tuned mass damper is attracted to the bridge surface and cooperates with the damper fixing support 9 to further enhance the installation stability of the device. The negative pressure suction cup 10 is connected to the damper base 8 by a screw. The height of the negative pressure suction cup 10 can be adjusted by turning the screw so that its bottom can contact the ground during operation.

[0025] A mass unit limiting mechanism 2 and a spring unit 7 are arranged above the damper chassis 8. A mass unit 3 is arranged above the spring unit 7. A top steel plate 1 is arranged above the mass unit limiting mechanism 2. The mass unit limiting mechanism 2 is located at the four corners of the damper chassis 8. The four corners of the mass unit 3 are in contact with the mass unit limiting mechanism 2. The mass unit limiting mechanism 2 is used to limit the horizontal displacement of the mass unit 3 and ensure its vertical movement. There is a certain distance between the mass unit 3 and the top steel plate 1 so that the mass unit 3 and the top steel plate 1 will not collide during the vibration of the tuned mass damper.

[0026] Mass unit 3 is connected to adjustable damping unit 4, and the other end of adjustable damping unit 4 is connected to damper chassis 8. Adjustable damping unit 4 is responsible for dissipating the energy of mass unit 3 during vibration. By adjusting the damping coefficient of adjustable damping unit 4, the rate of vibration decay of mass unit 3 can be controlled.

[0027] like Figure 2 As shown, mass unit 3 is the core inertial mass of the device. By changing the total mass of mass unit 3, the magnitude of the inertial force and the natural frequency of the entire damping system can be adjusted to adapt to different vibration reduction requirements.

[0028] The mass unit 3 is provided with a gas-liquid partition plate 13, which divides the mass unit 3 into an air chamber 23 and a counterweight liquid chamber 24. The air chamber 23 is located above the gas-liquid partition plate 13, and the counterweight liquid chamber 24 is located below the gas-liquid partition plate 13. The mass unit 3 is provided with a gas valve 5 and a counterweight liquid valve 6. The gas valve 5 is connected to the air chamber 23, and the counterweight liquid valve 6 is connected to the counterweight liquid chamber 24.

[0029] When mass needs to be increased, counterweight liquid is injected into the counterweight liquid chamber 24 through the counterweight liquid valve 6. The increase in counterweight liquid pushes the gas-liquid separator 13 upward, compressing the air chamber 23, and the internal air is discharged through the gas valve 5. When mass needs to be decreased, the counterweight liquid is discharged through the counterweight liquid valve 6. The counterweight liquid decreases, the gas-liquid separator 13 moves downward, the volume of the air chamber 23 expands, and outside air is drawn in through the gas valve 5. The change in the amount of counterweight liquid directly changes the total mass of the mass unit 3, thereby adjusting the inertial force and natural frequency of the entire tuned mass damper.

[0030] A sealing ring 12 is provided between the gas-liquid separator 13 and the inner wall of the mass unit 3. The sealing ring 12 is used to prevent gas or liquid leakage and ensure the reliability of mass regulation.

[0031] like Figure 3 As shown, spring unit 7 provides elasticity to the entire system. By adjusting the overall stiffness of spring unit 7, the natural frequency of the damper can be changed, thereby achieving tuning with the target vibration frequency.

[0032] The spring unit 7 includes several compression springs 15 arranged in an array. The upper end of the compression spring 15 is connected to a top support steel plate 14, which is connected to the mass unit 3. A threaded support steel column 17 is located at the center of the compression spring 15. The lower end of the threaded support steel column 17 is connected to a bottom support steel plate 21, which is connected to the damper chassis 8. The top support steel plate 14 is connected to the compression spring 15 through a spring fixing buckle 18.

[0033] The upper end of the threaded support steel column 17 is not in contact with the top support steel plate 14 and there is a certain distance between them. This distance ensures that the threaded support steel column 17 will not collide with the top support steel plate 14 when the tuned mass damper vibrates. The lower end of the compression spring 15 is not in contact with the bottom support steel plate 21 and there is a certain distance between them. This distance ensures that the compression spring 15 will not collide with the bottom support steel plate 21 when the tuned mass damper vibrates.

[0034] A support steel arm 16 is provided on the threaded support steel column 17. The support steel arm 16 is connected to a friction type buckle 20. The friction type buckle 20 is connected to a compression spring 15. The threaded support steel column 17 at both ends of the support steel arm 16 is provided with screw-in nuts 19. Each support steel arm 16 is connected to several friction type buckles 20.

[0035] The section of the compression spring 15 from the friction-type buckle 20 to the top support steel plate 14 is the effective working section of the compression spring 15. The stiffness of the overall spring unit 7 can be changed by changing the effective working length of the compression spring 15, thereby changing the frequency of the tuned mass damper.

[0036] During adjustment, first remove the friction clip 20 to disengage the compression spring 15 from the support steel arm 16; then rotate the screw nut 19 on the threaded support steel column 17 to move the support steel arm 16 up and down along the threaded support steel column 17 to the target height, thereby changing the clamping position of the friction clip 20 on the compression spring 15; then rotate the support steel arm 16 to re-engage the friction clip 20 on the corresponding spring ring of the compression spring 15, completing the adjustment.

[0037] The hydraulic mechanism 22 and the negative pressure generating mechanism in this tuned mass damper are connected to the power supply via a power connection cable during use.

[0038] The mobile, multi-parameter adjustable bridge tuned mass damper described in this embodiment operates as follows: The mobile, multi-parameter adjustable bridge tuned mass damper is moved to the target position on the bridge using the guide wheel 11. The hydraulic mechanism 22 is activated to extend the damper's fixing legs 9, lifting the device until it is suspended above the guide wheel 11. At the same time, the negative pressure generating mechanism works, causing the negative pressure suction cup 10 to adhere to the bridge deck and complete the fixation.

[0039] The parameters are adjusted according to the vibration frequency of the bridge to be suppressed.

[0040] When adjusting the mass, the counterweight liquid is injected into or discharged into the counterweight liquid chamber 24 through the counterweight liquid valve 6, and the gas-liquid separator 13 moves accordingly, changing the total mass of the mass unit 3. When adjusting the stiffness, disassemble the friction type buckle 20, rotate the screw-in nut 19 on the threaded support steel column 17, and drive the support steel arm 16 and the friction type buckle 20 to move up and down, change the effective clamping position of the compression spring 15, and adjust the stiffness of the overall spring unit 7; when adjusting the damping, adjust the damping coefficient of the adjustable damping unit 4.

[0041] When a bridge experiences multi-mode vibrations simultaneously, the order n to be suppressed is determined according to the vibration control requirements, and n sets of the tuned mass dampers of this invention are prepared.

[0042] Based on the first-order frequency, adjust the mass, stiffness, and damping parameters of the first group of tuned mass dampers, and move and fix this group of tuned mass dampers at the peak of the first-order vibration mode. Based on the second-order frequency, adjust the parameters of the second group of tuned mass dampers and arrange them at the peak of the second-order vibration mode; and so on, until all n groups of tuned mass dampers are deployed. All groups of dampers work simultaneously to jointly suppress multiple harmful vibrations of the bridge, avoiding the drawback of fixed-parameter dampers in traditional schemes that only have a single vibration suppression frequency band.

[0043] When the work is completed or vibration reduction is no longer needed, the negative pressure suction cup 10 releases the negative pressure, the hydraulic mechanism 22 retracts the damper fixing leg 9 so that the guide wheel 11 touches the ground, and the bridge tuned mass damper is moved off the bridge deck or moved to other bridges that need vibration suppression.

[0044] Therefore, the present invention employs a mobile, multi-parameter adjustable bridge tuned mass damper, which, through a mass unit, an adjustable damping unit, and a spring unit, allows for flexible adjustment of the damper's mass, damping, and stiffness parameters, thereby suppressing harmful vibrations in different frequency bands. Furthermore, due to its portability, it can be spatially distributed in various ways, and can be removed and reused when not in use, reducing the daily burden on the bridge, improving the damper's utilization rate, and lowering the bridge's maintenance costs.

[0045] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit them. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can still be made to the technical solutions of the present invention, and these modifications or equivalent substitutions cannot cause the modified technical solutions to deviate from the spirit and scope of the technical solutions of the present invention.

Claims

1. A mobile, multi-parameter adjustable bridge tuned mass damper, characterized in that: The device includes a damper chassis, with guide wheels located below the chassis. A mass unit limiting mechanism and a spring unit are located above the chassis. A mass unit is located above the spring unit, and a gas-liquid separator is installed within the mass unit, dividing it into an air chamber and a counterweight liquid chamber. The spring unit includes a compression spring and a threaded support steel column. A support steel arm is installed on the threaded support steel column, and the support steel arm is connected to a friction-type buckle, which is connected to the compression spring. A top steel plate is located above the mass unit limiting mechanism. An adjustable damping unit is connected to the mass unit, and the other end of the adjustable damping unit is connected to the damper chassis.

2. The movable, multi-parameter adjustable bridge tuned mass damper according to claim 1, characterized in that: The damper chassis is equipped with damper fixing feet and negative pressure suction cups at the four corners below.

3. A mobile, multi-parameter adjustable bridge tuned mass damper according to claim 2, characterized in that: A hydraulic mechanism is provided on the damper chassis, and the hydraulic mechanism is connected to the damper's fixed support legs.

4. A mobile, multi-parameter adjustable bridge tuned mass damper according to claim 2, characterized in that: The negative pressure suction cup is equipped with a negative pressure generating mechanism.

5. A mobile, multi-parameter adjustable bridge tuned mass damper according to claim 1, characterized in that: The air chamber is located above the gas-liquid separator, and the counterweight liquid chamber is located below the gas-liquid separator.

6. A mobile, multi-parameter adjustable bridge tuned mass damper according to claim 1, characterized in that: A sealing ring is provided between the gas-liquid separator and the inner wall of the mass unit.

7. A mobile, multi-parameter adjustable bridge tuned mass damper according to claim 1, characterized in that: The mass unit is equipped with a gas valve and a counterweight liquid valve. The gas valve is connected to the air chamber, and the counterweight liquid valve is connected to the counterweight liquid chamber.

8. A mobile, multi-parameter adjustable bridge tuned mass damper according to claim 1, characterized in that: The mass unit limiting mechanism is located at the four corners of the damper chassis, and the four corners of the mass unit are attached to the mass unit limiting mechanism.

9. A mobile, multi-parameter adjustable bridge tuned mass damper according to claim 1, characterized in that: The spring unit includes a plurality of compression springs arranged in an array. The upper end of each compression spring is connected to a top support steel plate, which is connected to the mass unit. A threaded support steel column is located at the center of the compression spring, and the lower end of the threaded support steel column is connected to a bottom support steel plate, which is connected to the damper chassis.

10. A mobile, multi-parameter adjustable bridge tuned mass damper according to claim 9, characterized in that: The threaded support steel columns at both ends of the support steel arm are provided with screw-in nuts, each support steel arm is connected with a number of friction-type buckles, and the top support steel plate is connected to the compression spring through spring fixing buckles.

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